Re: [Pre-PATCH] Overhaul of the LaTeX preview system

[Karthik Chikmagalur]

> The preview now works as stated, although I find it kinda slow to
> regenerate, even if I set `org-latex-preview-throttle' to 0.2.

They shouldn't be any slower than when you manually call
`org-latex-preview' on a fragment.  To be sure, you could try

(setq org-latex-preview-debounce 0.3
      org-latex-preview-throttle 0.3)

and then turn on (or turn off + on) `org-latex-preview-auto-mode'.

> Also for some reason my previews appear to the right of the cursor,
> instead of under it like in the linked webm.

The video you linked to was a proof of concept.  Here is a demo of the
current design: https://tinyurl.com/ms2ksthc

If `org-latex-preview-live-display-type' is set to `eldoc':
- show live previews using Eldoc.  You may need to pop up the Eldoc doc
buffer for larger previews to be visible (`M-x eldoc-mode', followed by
`M-x eldoc-doc-buffer').

Else:
- Inline fragments are live-previewed inline
- LaTeX environments are previewed below the environment

> My last problem is that exports are kinda borked. For example, these
> days I started using `org-msg' and when my email exports to html and
> latex is included, one of these happen:
>
> - The fragment appears as a blank image when the options `tex:dvipg' or
>   `tex:dvisvg' are used.
> - The email doesn't even export to html with a message like
>   `org-html-latex-image: Expected LaTeX preview
>     "424ed928d1eaca9e3c4c588469a4a0b87a7f4329" to exist in the cache'
>   with the option `tex:imagemagick'.

Tecosaur will have a better idea of what's happening here.  Note that
the export options for html are `tex:dvipng' or `tex:dvisvgm', not
`dvipg' and `dvisvg'.

>> If the live preview is not removed automatically after you move away
>> from a LaTeX fragment, you might have to manually eval
>> `(org-latex-preview-live--clearout)'.
>
> Yeah, it happens to me to. Even if I remove the fragment the preview
> persists.

It shouldn't be happening every time -- only when certain conditions are
met.  Deleting fragments might be one of these conditions.

-Karthik